/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.bu.android.bluetoothlegatt;

import android.app.Service;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCallback;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattDescriptor;
import android.bluetooth.BluetoothGattService;
import android.bluetooth.BluetoothManager;
import android.bluetooth.BluetoothProfile;
import android.content.Context;
import android.content.Intent;
import android.os.Binder;
import android.os.Environment;
import android.os.Handler;
import android.os.IBinder;
import android.util.Log;



import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.math.BigInteger;
import java.util.List;
import java.util.UUID;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Service for managing connection and data communication with a GATT server hosted on a
 * given Bluetooth LE device.
 */
public class BluetoothLeServiceCobra extends Service {
    private final static String TAG = BluetoothLeServiceCobra.class.getSimpleName();

    private BluetoothManager mBluetoothManager;
    private BluetoothAdapter mBluetoothAdapter;
    private String mBluetoothDeviceAddress;
    private BluetoothGatt mBluetoothGatt;
    private int mConnectionState = STATE_DISCONNECTED;

    private static final int STATE_DISCONNECTED = 0;
    private static final int STATE_CONNECTING = 1;
    private static final int STATE_CONNECTED = 2;

    public final static String ACTION_GATT_CONNECTED =
            "com.bu.bluetooth.le.ACTION_GATT_CONNECTED";
    public final static String ACTION_GATT_DISCONNECTED =
            "com.bu.bluetooth.le.ACTION_GATT_DISCONNECTED";
    public final static String ACTION_GATT_SERVICES_DISCOVERED =
            "com.bu.bluetooth.le.ACTION_GATT_SERVICES_DISCOVERED";
    public final static String ACTION_DATA_AVAILABLE =
            "com.bu.bluetooth.le.ACTION_DATA_AVAILABLE";
    public final static String ACTION_DATA_READ_FINISH =
            "com.bu.bluetooth.le.ACTION_DATA_READ_FINISH";
    public final static String EXTRA_DATA =
            "com.bu.bluetooth.le.EXTRA_DATA";
    public final static String EXTRA_DATA_NORMAL =
            "com.bu.bluetooth.le.EXTRA_DATA.F001";
    public final static String EXTRA_DATA_CALIB =
            "com.bu.bluetooth.le.EXTRA_DATA.F011";
    public final static String EXTRA_DATA_CALIB_CHECK =
            "com.bu.bluetooth.le.EXTRA_DATA.F021";

    private final static UUID UUID_HEART_RATE_MEASUREMENT =
            UUID.fromString(SampleGattAttributes.HEART_RATE_MEASUREMENT);
    public void appendLog(String text,String address)
    {
        String parentPath=null;
        String filePath = null;
        parentPath=Environment.getExternalStorageDirectory().getPath()+"/0jasonbu_biao/";//+address+".txt";
        filePath = parentPath+address+".txt";
        File logFileParent = new File(parentPath);//("/sdcard/0biao/log.txt");

        if (!logFileParent.exists())
        {
                logFileParent.mkdirs();
                //logFile.createNewFile();
        }
        File logFile = new File(filePath);
        Log.d(TAG,filePath);
        if (!logFile.exists())
        {
            try
            {
                logFile.createNewFile();

            }
            catch (IOException e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        try
        {
            //BufferedWriter for performance, true to set append to file flag
            BufferedWriter buf = new BufferedWriter(new FileWriter(logFile, true));
            buf.append(text);
            buf.newLine();
            buf.close();
        }
        catch (IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public String toHex(String arg) {
        return String.format("%040x", new BigInteger(1, arg.getBytes(/*YOUR_CHARSET?*/)));
    }
    // Implements callback methods for GATT events that the app cares about.  For example,
    // connection change and services discovered.
    private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
        @Override
        public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
            String intentAction;
            if (newState == BluetoothProfile.STATE_CONNECTED) {
                intentAction = ACTION_GATT_CONNECTED;
                mConnectionState = STATE_CONNECTED;
                broadcastUpdate(intentAction);
                Log.i(TAG, "Connected to GATT server.");
                // Attempts to discover services after successful connection.
                Log.i(TAG, "Attempting to start service discovery:" +
                        mBluetoothGatt.discoverServices());

            } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
                intentAction = ACTION_GATT_DISCONNECTED;
                mConnectionState = STATE_DISCONNECTED;
                Log.i(TAG, "Disconnected from GATT server.");
                broadcastUpdate(intentAction);
            }
        }

        //private final UUID CHARACTERISTIC_UPDATE_NOTIFICATION_DESCRIPTOR_UUID = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb");

        @Override
        public void onServicesDiscovered(BluetoothGatt gatt, int status) {
            if (status == BluetoothGatt.GATT_SUCCESS) {
                List<BluetoothGattService> services = gatt.getServices();
//                for(BluetoothGattService s:services)
//                {
//                    int uuid_short_service = SampleGattAttributes.GetUUID16BitFromString(s.getUuid().toString());
//                    if(uuid_short_service != 0)
//                    {
//                        Log.d(TAG, "onServicesDiscovered: " + String.format("0x%04X", uuid_short_service));
//                    }
//                    else
//                    {
//                        Log.v(TAG, "onServicesDiscovered: " + s.getUuid().toString() );
//                    }
//                    if(uuid_short_service == 0xF000)
//                    {
//                        List<BluetoothGattCharacteristic> cs = s.getCharacteristics();
//                        for(BluetoothGattCharacteristic c: cs)
//                        {
//                            int uuid_short_char = SampleGattAttributes.GetUUID16BitFromString(c.getUuid().toString());
//                            if(uuid_short_char != 0)
//                            {
//                                Log.e(TAG, "onCharacteristicDiscovered: " + String.format("0x%04X", uuid_short_char));
//                            }
//                            else
//                            {
//                                Log.v(TAG, "onCharacteristicDiscovered: " + c.getUuid().toString() );
//                            }
//
//                            if(uuid_short_char == 0xF001)
//                            {
//                                Boolean isOK;
//                                mBluetoothGatt.setCharacteristicNotification(c, true);
//
//                                BluetoothGattDescriptor d = c.getDescriptor(SampleGattAttributes.CHARACTERISTIC_UPDATE_NOTIFICATION_DESCRIPTOR_UUID);
//                                d.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
//                                isOK = mBluetoothGatt.writeDescriptor(d);
//                                Log.e(TAG, "Enable Resule " + uuid_short_char + "is " + isOK);
//                            }
//                        }
//                    }
//                }
                broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED);
            } else {
                Log.w(TAG, "onServicesDiscovered received: " + status);
            }
        }

        @Override
        public void onCharacteristicRead(BluetoothGatt gatt,
                                         BluetoothGattCharacteristic characteristic,
                                         int status) {
            if (status == BluetoothGatt.GATT_SUCCESS) {
                broadcastUpdate(ACTION_DATA_READ_FINISH, characteristic);
            }
        }

        @Override
        public void onCharacteristicChanged(BluetoothGatt gatt,
                                            BluetoothGattCharacteristic characteristic) {
            broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
            String address = gatt.getDevice().getAddress();
            String s = "0x";
            byte[] buffer = characteristic.getValue();
            String temStr = characteristic.getStringValue(0);
            temStr = toHex(temStr);
            //String hexString = Hex.encodeHexString(buffer);
            for(byte b:buffer)
            {
                s = s + String.format("%02X",b);
            }
            appendLog(s,address);
            Log.d(TAG, s);
            Log.d(TAG, temStr);
        }
    };

    private void broadcastUpdate(final String action) {
        final Intent intent = new Intent(action);
        sendBroadcast(intent);
    }

    private void broadcastUpdate(final String action,
                                 final BluetoothGattCharacteristic characteristic) {
        final Intent intent = new Intent(action);

        final String ExtraDataType;
        // This is special handling for the Heart Rate Measurement profile.  Data parsing is
        // carried out as per profile specifications:
        // http://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml
        if(SampleGattAttributes.XCOBRA_CHAR_NORMAL_NOTIFY.equals(characteristic.getUuid().toString()))
        {
            ExtraDataType = EXTRA_DATA_NORMAL;
        }
        else if(SampleGattAttributes.XCOBRA_CHAR_CALIB_NOTIFY.equals(characteristic.getUuid().toString()))
        {
            ExtraDataType = EXTRA_DATA_CALIB;
        }
        else if(SampleGattAttributes.XCOBRA_CHAR_CALIB_CHECK_NOTIFY.equals(characteristic.getUuid().toString()))
        {
            ExtraDataType = EXTRA_DATA_CALIB_CHECK;
        }
        else
        {
            ExtraDataType = EXTRA_DATA;
        }
        final byte[] data = characteristic.getValue();
        intent.putExtra(ExtraDataType, data);
        sendBroadcast(intent);
    }

    public class LocalBinder extends Binder {
        BluetoothLeServiceCobra getService() {
            return BluetoothLeServiceCobra.this;
        }
    }

    @Override
    public IBinder onBind(Intent intent) {
        return mBinder;
    }

    @Override
    public boolean onUnbind(Intent intent) {
        // After using a given device, you should make sure that BluetoothGatt.close() is called
        // such that resources are cleaned up properly.  In this particular example, close() is
        // invoked when the UI is disconnected from the Service.
        close();
        return super.onUnbind(intent);
    }

    private final IBinder mBinder = new LocalBinder();

    /**
     * Initializes a reference to the local Bluetooth adapter.
     *
     * @return Return true if the initialization is successful.
     */
    public boolean initialize() {
        // For API level 18 and above, get a reference to BluetoothAdapter through
        // BluetoothManager.
        if (mBluetoothManager == null) {
            mBluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
            if (mBluetoothManager == null) {
                Log.e(TAG, "Unable to initialize BluetoothManager.");
                return false;
            }
        }

        mBluetoothAdapter = mBluetoothManager.getAdapter();
        if (mBluetoothAdapter == null) {
            Log.e(TAG, "Unable to obtain a BluetoothAdapter.");
            return false;
        }

        return true;
    }

    /**
     * Connects to the GATT server hosted on the Bluetooth LE device.
     *
     * @param address The device address of the destination device.
     *
     * @return Return true if the connection is initiated successfully. The connection result
     *         is reported asynchronously through the
     *         {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
     *         callback.
     */
    public boolean connect(final String address) {
        if (mBluetoothAdapter == null || address == null) {
            Log.w(TAG, "BluetoothAdapter not initialized or unspecified address.");
            return false;
        }

        // Previously connected device.  Try to reconnect.
        if (mBluetoothDeviceAddress != null && address.equals(mBluetoothDeviceAddress)
                && mBluetoothGatt != null) {
            Log.d(TAG, "Trying to use an existing mBluetoothGatt for connection.");
            if (mBluetoothGatt.connect()) {
                mConnectionState = STATE_CONNECTING;
                return true;
            } else {
                return false;
            }
        }

        final BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
        if (device == null) {
            Log.w(TAG, "Device not found.  Unable to connect.");
            return false;
        }
        // We want to directly connect to the device, so we are setting the autoConnect
        // parameter to false.
        mBluetoothGatt = device.connectGatt(this, false, mGattCallback);
        Log.d(TAG, "Trying to create a new connection.");
        mBluetoothDeviceAddress = address;
        mConnectionState = STATE_CONNECTING;
        return true;
    }

    /**
     * Disconnects an existing connection or cancel a pending connection. The disconnection result
     * is reported asynchronously through the
     * {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
     * callback.
     */
    public void disconnect() {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        mBluetoothGatt.disconnect();
    }

    /**
     * After using a given BLE device, the app must call this method to ensure resources are
     * released properly.
     */
    public void close() {
        if (mBluetoothGatt == null) {
            return;
        }
        mBluetoothGatt.close();
        mBluetoothGatt = null;
    }

    /**
     * Request a read on a given {@code BluetoothGattCharacteristic}. The read result is reported
     * asynchronously through the {@code BluetoothGattCallback#onCharacteristicRead(android.bluetooth.BluetoothGatt, android.bluetooth.BluetoothGattCharacteristic, int)}
     * callback.
     *
     * @param characteristic The characteristic to read from.
     */
    public void readCharacteristic(BluetoothGattCharacteristic characteristic) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        mBluetoothGatt.readCharacteristic(characteristic);
    }

    /**
     * Enables or disables notification on a give characteristic.
     *
     * @param characteristic Characteristic to act on.
     * @param enabled If true, enable notification.  False otherwise.
     */
    public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic,
                                              boolean enabled) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);

        // This is specific to Heart Rate Measurement.
        //if (UUID_HEART_RATE_MEASUREMENT.equals(characteristic.getUuid())) {
        BluetoothGattDescriptor descriptor = characteristic.getDescriptor(
                SampleGattAttributes.CHARACTERISTIC_UPDATE_NOTIFICATION_DESCRIPTOR_UUID);
        descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
        mBluetoothGatt.writeDescriptor(descriptor);
        //}
    }

    /**
     * Retrieves a list of supported GATT services on the connected device. This should be
     * invoked only after {@code BluetoothGatt#discoverServices()} completes successfully.
     *
     * @return A {@code List} of supported services.
     */
    public List<BluetoothGattService> getSupportedGattServices() {
        if (mBluetoothGatt == null) return null;

        return mBluetoothGatt.getServices();
    }
}
